AH Scorpii information

AH Scorpii
Observation data; Epoch J2000 Equinox J2000
Constellation	Scorpius
Right ascension	17h 11m 17.01945s
Declination	−32° 19′ 30.7140″
Apparent magnitude (V)	6.5 - 9.6
Characteristics
Spectral type	M4-5 Ia-Iab
B−V color index	+2.57
Variable type	SRc
Astrometry
Radial velocity (Rv)	−13.40±2.4 km/s
Proper motion (μ)	RA: −2.322±0.115 mas/yr ; Dec.: −2.610±0.068 mas/yr
Parallax (π)	0.5632 ± 0.0799 mas
Distance	7,400±620 ly ; (2,260±190 pc)
Absolute magnitude (MV)	−5.8
Details
Mass	20 M☉
Radius	1,411±124 R☉
Luminosity	330,000+270,000; −150,000 L☉
Surface gravity (log g)	−0.5 cgs
Temperature	3,682 K
Other designations
	AH Sco, AN 223.1907, GSC 07365-00527, HD 155161, HIP 84071, CD−32°12429, 2MASS J17111702-3219308, IRC−30282, IRAS 17080-3215, RAFGL 1927, AAVSO 1704-32
Database references
SIMBAD	data

AH Scorpii (abbreviated to AH Sco) is a red supergiant variable star located in the constellation Scorpius. It is one of the largest stars known by radius and is also one of the most luminous red supergiant stars in the Milky Way.

^ ^a ^b ^c ^d ^e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. (2006). "Variability in red supergiant stars: Pulsations, long secondary periods and convection noise". Monthly Notices of the Royal Astronomical Society. 372 (4): 1721–1734. arXiv:astro-ph/0608438. Bibcode:2006MNRAS.372.1721K. doi:10.1111/j.1365-2966.2006.10973.x. S2CID 5203133.
^ ^a ^b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
^ ^a ^b ^c ^d ^e Arroyo-Torres, B.; Wittkowski, M.; Marcaide, J. M.; Hauschildt, P. H. (2013). "The atmospheric structure and fundamental parameters of the red supergiants AH Scorpii, UY Scuti, and KW Sagittarii". Astronomy & Astrophysics. 554: A76. arXiv:1305.6179. Bibcode:2013A&A...554A..76A. doi:10.1051/0004-6361/201220920. S2CID 73575062.
^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
^ Cite error: The named reference chen was invoked but never defined (see the help page).
^ Baudry, A.; Le Squeren, A. M.; Lepine, J. R. D. (1977). "The supergiant OH stars S Per and AH SCO - Conditions for OH emission in circumstellar envelopes". Astronomy and Astrophysics. 54: 593. Bibcode:1977A&A....54..593B.
^ González-Torà, G.; Wittkowski, M.; Davies, B.; Plez, B. (2024-03-01). "The effect of winds on atmospheric layers of red supergiants II. Modelling VLTI/GRAVITY and MATISSE observations of AH Sco, KW Sgr, V602 Car, CK Car, and V460 Car". Astronomy and Astrophysics. 683: A19. arXiv:2312.12521. Bibcode:2024A&A...683A..19G. doi:10.1051/0004-6361/202348047. ISSN 0004-6361.

[edr3-1] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[kiss-2] Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. (2006). "Variability in red supergiant stars: Pulsations, long secondary periods and convection noise". Monthly Notices of the Royal Astronomical Society. 372 (4): 1721–1734. arXiv:astro-ph/0608438. Bibcode:2006MNRAS.372.1721K. doi:10.1111/j.1365-2966.2006.10973.x. S2CID 5203133.

[gcvs-3] Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.

[torres2013-4] Arroyo-Torres, B.; Wittkowski, M.; Marcaide, J. M.; Hauschildt, P. H. (2013). "The atmospheric structure and fundamental parameters of the red supergiants AH Scorpii, UY Scuti, and KW Sagittarii". Astronomy & Astrophysics. 554: A76. arXiv:1305.6179. Bibcode:2013A&A...554A..76A. doi:10.1051/0004-6361/201220920. S2CID 73575062.

[5] Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.

[chen-6] Cite error: The named reference chen was invoked but never defined (see the help page).

[baudry-7] Baudry, A.; Le Squeren, A. M.; Lepine, J. R. D. (1977). "The supergiant OH stars S Per and AH SCO - Conditions for OH emission in circumstellar envelopes". Astronomy and Astrophysics. 54: 593. Bibcode:1977A&A....54..593B.

[gonzalez2024-8] González-Torà, G.; Wittkowski, M.; Davies, B.; Plez, B. (2024-03-01). "The effect of winds on atmospheric layers of red supergiants II. Modelling VLTI/GRAVITY and MATISSE observations of AH Sco, KW Sgr, V602 Car, CK Car, and V460 Car". Astronomy and Astrophysics. 683: A19. arXiv:2312.12521. Bibcode:2024A&A...683A..19G. doi:10.1051/0004-6361/202348047. ISSN 0004-6361.

Observation data Epoch J2000 Equinox J2000
Constellation	Scorpius
Right ascension	17^h 11^m 17.01945^s^[1]
Declination	−32° 19′ 30.7140″^[1]
Apparent magnitude (V)	6.5 - 9.6^[2]
Characteristics
Spectral type	M4-5 Ia-Iab^[3]
B−V color index	+2.57^[4]
Variable type	SRc^[3]
Astrometry

Radial velocity (R_v)	−13.40±2.4^[5] km/s
Proper motion (μ)	RA: −2.322±0.115^[1] mas/yr Dec.: −2.610±0.068^[1] mas/yr
Parallax (π)	0.5632 ± 0.0799 mas^[1]
Distance	7,400±620 ly (2,260±190^[6] pc)
Absolute magnitude (M_V)	−5.8^[7]

Details

Mass	20^[8] `M`_☉
Radius	1,411±124^[4] `R`_☉
Luminosity	330,000+270,000 −150,000^[4] `L`_☉
Surface gravity (log g)	−0.5^[4] cgs
Temperature	3,682^[4] K

Other designations
AH Sco, AN 223.1907, GSC 07365-00527, HD 155161, HIP 84071, CD−32°12429, 2MASS J17111702-3219308, IRC−30282, IRAS 17080-3215, RAFGL 1927, AAVSO 1704-32
Database references
SIMBAD	data

AH Scorpii information

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